Idea: Why not allow time syncing based on an image taken at the same time?

This shouldn't be too hard to code, but why not add functionality so that a first/second shooter can take an image with any number of cameras (4 would be typical) and then time sync all images taken that day to the time when those images were taken. So we both take a photo of the back of my car, select all of those and time sync based on that time. Sounds good right?